预应力混凝土连续箱梁开裂后的刚度退化模型  

Stiffness Degeneration Model of Prestressed Concrete Continuous Box Girder After Cracking

作　　者：叶见曙[1] 张峰[1] 

机构地区：[1]东南大学交通学院,江苏南京210096

出　　处：《中国公路学报》2007年第6期67-72,共6页China Journal of Highway and Transport

基　　金：国家西部交通建设科技项目(200331822315);江苏省交通科学研究计划项目(04Y051)

摘　　要：为了研究预应力混凝土连续箱梁开裂后的刚度退化规律,基于CB壳单元,采用层状模型模拟预应力混凝土结构;考虑加载和卸载效应及材料和几何双重非线性效应,有效地模拟了三跨连续斜交箱梁的开裂、屈服和失效全过程。基于非线性有限元分析,提出了一种预应力混凝土箱梁开裂后的刚度退化模型,由该模型计算了预应力混凝土箱梁开裂后的刚度折减量。结果表明:CB壳单元模型对于预应力混凝土箱梁的非线性分析有良好的适应性,对箱梁开裂后的使用性能评估有实际应用价值。In order to study stiffness degeneration rules of prestressed concrete continuous box girder after cracking, considering loading and unloading effect, material and geometric hinonlinear effect, whole process of cracking, yielding, failure of a three-span continuous skew box girder was simulated effctively by using CB shell element and layered model on simulation of prestressed concrete structure. A stiffness degeneration model of prestressed concrete continuous box girder after cracking was put forward based on nonlinear finite analysis. In the same time, the stiffness degeneration value of prestress concrete continuous box girder was computed based on presented model. The results show that CB shell element can well describe the nonlinear behavior of concrete box girders and is valuable to evaluate the service ability of the cracked box girder.

关 键 词：桥梁工程 连续箱梁 非线性有限元分析 刚度退化模型 CB壳单元 层状模型 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]